According to a review of evidence in a medical journal, runners live three years     1    (long) than non-runners. You don't have to run fast or for long    2    (see)the benefit. You may drink, smoke, be overweight and still reduce your risk of     3     (die) early by running. While running regularly can't make you live forever, the review says it     4     (be) more effective at lengthening life    5     walking, cycling or swimming. Two of the authors of the review also made a study published in 2014    6    showed a mere five to 10 minutes A day of running reduced the risk of heart disease and early deaths from all     7    (cause).

The best exercise is one that you enjoy and will do. But otherwise…   it's probably running. To avoid knee pain, you can run on soft surfaces, do exercises to    8    (strength)your leg muscles(肌肉),avoid hills and get good running shoes. Running is cheap, easy and it's always    9    (energy).If you are time poor, you need run for only half the time to get the same benefits as other sports, so perhaps we should all give    10    a try.

3 . Teenagers’ fitness is now a major concern，and physical exercise is very important. It reduces stress and improves fitness. Exercise makes your body strong，and helps you to keep the right body weight. Sports scientist Dr. Helen Lopez offers the following advice to teenagers：“First，you need to find out your present level of fitness. Then you can design a programme that will help you become healthier.”

Dr. Lopez suggests that there are three levels of fitness that need a change of lifestyle.“Overweight”means that the person gets very little exercise and often has a serious weight problem. “Inactive” means that the person does not join in many physical activities，but is not seriously overweight.“Active”refers to people who take part in sports and other physical activities，but do not have a high fitness level.

According to Dr. Lopez，overweight teenagers should work out to keep healthy.“Ride a bike，play volleyball or basketball for a while，and go for a twenty­minute walk each day. All these will help to burn calories.”Inactive teenagers should do similar activities, but add some bending and stretching exercises, such as push­ups and sit­ups, starting with twenty of each a day.“Inactive people can take a little more exercise than overweight people because their bodies are stronger，”Dr. Lopez said. The same rule applies to active teenagers.

Dr. Lopez suggests one hour a week or more on running and other forms of intensive exercise，together with fifteen minutes a day spent on stretching and bending activities.“These are really important in order to prevent injuries,” Dr. Lopez said. Some weight­training and other body­strengthening exercises could also be planned in the programme in order to increase the person’s strength.

4 . All over the world people enjoy sports. Sports help to keep people healthy and happy, and to live longer.     1    They buy tickets or turn on their TVs to watch the games. Often they get very excited when their player or team wins.

    2    Football, for example, has spread around the world. Swimming is popular in all countries near the sea or in those with many rivers. What fun it is to jump into a pool or lake, whether in China, Egypt or Italy!     3    Think how many lovers to skate or ski in Japan, Norway or Canada.

Some sports or game go back thousands of years, like running or jumping. Chinese Kungfu, for example, has a very long history. But basketball and volleyball are rather new. Neither one is a hundred years old yet.     4    Water-skiing is one of the newest in the family of sports.

People from different countries may not be able to understand each other, but after a game together they often become good friends.     5    One learns to fight hard but fight fair, to win without pride and to lose with grace.

We all need physical exercise. Exercise uses up the food we eat and keeps the body energetic. It works your muscles and makes your heart work hard so as to send blood to your muscles. So exercise makes your heart and muscles strong. Exercise also makes you feel refreshed. If you take regular exercise, you will stay happy and healthy.

Some Western countries, such as the United States, have problems with exercise. In the US, many people lack exercise because it is hard for them. People have to work from dawn till dusk, so they don’t have time to take exercise. They work in office buildings sitting in chairs all day long in front of computers. They cannot get much exercise sitting at desk passively.

Some Westerners can get exercise by walking from their homes to workplaces. However, the majority of people cannot do this. It is too far from their homes to their offices. They have no choice but to drive to work. In fact, some have to drive one or two hours to their offices. This is unfavorable in two ways. First, these people don’t have a chance to exercise because they are sitting in their cars for two to four hours each day. Second, driving is challenging especially in rush hours and calls for too much attention. It makes a person very tired. So when these people arrive home at night, they don’t have the desire to take exercise after work.

Today, many people in the West are overweight, which causes health problems for them. Doctors say exercise can help people both lose weight and improve their health. So many people are trying to get more exercise. But it takes time to change, and when people don’t see a difference right away, they will be discouraged and stop exercising.